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From the New York Times in the USA:
African Fossil Changes Ideas of Ant Origins
By SINDYA N. BHANOO
Published: April 5, 2010
The finding is part of a larger study published in the Proceedings of the National Academy of Sciences identifying 28 fossilized insects, one spider and one mite, as well as a variety of flora all trapped in amber from Ethiopia.
Until now, paleontologists had assumed that ants originated in North America or South Asia, because the only known fossils were from these regions, said Alexander Schmidt, the paper’s lead author and a biologist at the University of Göttingen in Germany.
He and his colleagues are convinced that further analysis will reveal more about the evolution of the ants and how the Ethiopian ant is biologically related to Cretaceous ants of the Northern Hemisphere.
New insect species discovered: here.
Fossil reveals 48-million-year history of zombie ants: here.
Ethiopia: Evidence of Mammals and Legumes, 22 Million Years Old: here.